The bus or train mostly for sorting out the complicated stuff, then the toilet for putting on the finishing touches.
1. Read over the problem a few times.
2. Ride the bus, figure out the key insight involved.
3. Having arrived at your destination, use the bathroom, and in doing so sort out the specifics of your approach and iron out any issues with the details.
4. Grab some paper (wash your hands first) and write out the solution to the problem.
Happened exactly that way so many times in college lol
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